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Abstract:
Due to the presence of 4p and 4d open shells, the electronic structure of highly
charged bismuth ions is particularly di_cult to calculate. Since practically no
experimental data for these ions are available, the optical spectrum of Bi ions in
charge states q = 36 to 55 was systematically investigated. The ions were produced
with the Heidelberg Electron Beam Ion Trap, and the spectra observed by means
of a Czerny-Turner spectrometer. A total of 25 previously unknown spectral lines
were found, and their wavelengths determined with a relative accuracy of 170 ppm
and better.Furthermore, in the second part of this work a spectrometer for the VUV
range was designed and built. The instrument was subsequently used in two
beamtimes at the FLASH. The aim of the experiments was to study the laser
activity of atomic transitions in xenon and krypton after inner-shell excitation with
FEL pulses. The instrument performed excellently, achieving a very high resolution
which will enable better determination of the properties of both the FEL and the
atomic lasers under study.
